1、BRITISH STANDARD BS 7164-2.2: 1990 ISO 4661-2: 1987 Chemical tests for raw and vulcanized rubber Part 2: Sample preparation Section 2.2 Vulcanized rubberBS7164-2.2:1990 This British Standard, having been prepared under the directionof the Rubber StandardsPolicy Committee, waspublished under the auth
2、orityof the Board of BSI andcomes into effect on 31 October 1990 BSI 07-1999 The following BSI references relate to the work on this standard: Committee references RUM 37 Draft for comment 83 54093 DC ISBN 0 580 18934 1 Committees responsible for this British Standard The preparation of this British
3、 Standard was entrusted by the Rubber Standards Policy Committee (RUM/-) to Technical Committee RUM/37, upon which the following bodies were represented: Institute of Water and Environmental Management Laboratory of the Government Chemist Ministry of Defence Royal Society of Chemistry Rubber and Pla
4、stics Research Association Amendments issued since publication Amd. No. Date CommentsBS7164-2.2:1990 BSI 07-1999 i Contents Page Committees responsible Inside front cover National foreword ii 0 Introduction 1 1 Scope and field of application 1 2 Preparation of samples 1 Publication(s) referred to In
5、side back coverBS7164-2.2:1990 ii BSI 07-1999 National foreword This Section of BS7164 has been prepared under the direction of the Rubber Standards Policy Committee and is identical with ISO4661-2:1987 “Rubber, vulcanized Preparation of samples and test pieces Part2: Chemical tests”, published by t
6、he International Organization for Standardization (ISO). BS7164 rationalizes all the methods that deal with chemical analysis of raw, compounded and vulcanized rubber, some of which have previously been published in BS903, BS1673 and BS5923. Relevant Parts of those standards will be withdrawn or del
7、eted by amendment, as appropriate, when superseded by Parts and Sections of BS7164. This Section of BS7164 supersedes Part B1 of BS903-B1:1958 to BS903-B5:1958 which is deleted by amendment. A British Standard does not purport to include all the necessary provisions of a contract. Users of British S
8、tandards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, pages1 and 2, an inside back cover and a back cover. Th
9、is standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover.ISO 4661-2:1987 (E) BSI 07-1999 1 0 Introduction International Standard ISO4661 for the preparation of samples and test pieces for rubbe
10、r testing comprises two parts: Part 1: Physical tests; Part 2: Chemical tests. This part of ISO4661 includes a number of factors of importance in the preparation of samples for chemical testing, in order to ensure the best use of the relevant ISO methods of test. When preparing samples of vulcanized
11、 rubber for chemical testing, care should be taken that any test portion is representative of the sample with respect to the property or constituent to be determined. Thus, if it is desired to deduce the composition of the original mix, any surface bloom should be incorporated, but if the final bulk
12、 composition is required, bloom should be removed preferably by using mechanical means. In the case of tests carried out with test pieces taken from manufacturers products, it may be necessary first to separate vulcanized rubber from other possible components of the manufactured products, such as me
13、tals, threads, tapes, fabrics as well as coatings or veneers that may cover it. This separation should be made using whenever possible mechanical means blades, abrasive wheels, files, etc. and avoiding any heat generation. 1 Scope and field of application This part of ISO4661 specifies a method of p
14、reparing samples from vulcanized rubber for use in chemical tests. 2 Preparation of samples 2.1 Soft vulcanized rubber The sample shall be comminuted with scissors, a rotating rasp, a suitable grinder or by cryogenic crushing to pass a sieve with an approximately1,7mm opening. Alternatively, it shal
15、l be sheeted to a thickness not exceeding 0,5mm by passing between cold, tightly closed rolls of a laboratory mill. The type of grinder or mill used is immaterial, provided that the sample does not become contaminated or unduly heated. 2.2 Ebonite The sample shall be rasped to powder which will pass
16、 a sieve with an approximately4004m opening. The powder shall be treated with a magnet to remove any iron particles. 2.3 Rubberized composites Where it is not possible to separate the rubber mechanically, the following procedure shall be carried out. The rubber shall be separated by exposing it to t
17、he vapour only of a suitable solvent. For composites based on NR, SBR and BR, methylene chloride or1,1,1-trichloroethane are suitable solvents. NOTEThe time of exposure should be kept as short as possible to avoid any possibility of extracting plasticizers from the rubber compound. Afterwards, the s
18、wollen rubber shall have the solvent completely removed in air at room temperature and treated as described in 2.1. In cases where the rubber is chemically bonded to the substrate, it should be noted that the composition of the rubber in the region of the bond may be substantially different from tha
19、t in the bulk of the material. In all cases, sampling shall be appropriate to the test being carried out. Even if the substrate can be removed “clean”, the remaining rubber may consist of more than one formulation, and the blending carried out subsequently in accordance with 2.1 may result in a samp
20、le for analysis which is not representative of any one original formulation. Such composite layers may be revealed by microscopic examination of a series of cross-sections of the material. It may then be possible, by careful buffing or cutting, to produce a sample of one or more rubber components fo
21、r individual analysis. Where it is impossible to separate the rubber from the substrate, the material shall be cut into a small cubes to pass a sieve with 2mm openings, and analysed as a whole. In this case, the proportion by mass of rubber in the composite may be determined by disintegration of the
22、 rubber in a hot high boiling solvent, and weighing before and after the treatment. It should be noted that there may be partial dissolution of any organic material in the composite (for example, fabric), and the results should be interpreted with caution. Where available, a sample of the non-rubber
23、 portion of the composite should also be analysed similarly. In reporting the results of any analysis, the method of separation used shall be specified. If separation was impossible, it shall be made clear that the sample analysed was a heterogeneous blend of rubber and substrate and the possibility
24、 of error due to inhomogeneity or inadequate separation of materials should be pointed out.2 blankBS7164-2.2:1990 BSI 07-1999 Publication(s) referred to See national foreword.BS 7164-2.2: 1990 ISO 4661-2: 1987 BSI 389 Chiswick High Road London W4 4AL BSIBritishStandardsInstitution BSI is the indepen
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